package cn.webrx;

public class T6 {
    static int aa;
    static Integer bb;
    public static void main(String[] args) {
        System.out.println(aa);
        System.out.println(bb);

        //int s1 = 1;
        //s1 = s1 + 1;
        //System.out.println(s1);

        short s1 = 1;
        //s1 = s1 + 1; //有错误
        s1 = (short) (s1 + 1);
        System.out.println(s1);

        s1 += 5; //s1 = s1 + 5;
        System.out.println(s1);
    }
}
